You may remember this letter from -- year old Charlotte that went viral a few months ago she asked -- For a little more girl power she wrote to the toy company quote I want. Did make more like little girl people and let them go on adventures and have fun OK eight and forever is actually better than Larry eight. I thought yeah. -- we're -- a -- little -- got an answer Lego is releasing a brand new kids and teachers females and all those important stem careers science. Technology engineering and math and the -- sent already sold out. On -- I -- -- I -- -- -- it was so pitchers like they just sit around and stay at home can you please say you know powerful wind -- ventures and says thank you guys aren't listening yeah. Is it time this genius but her granddaughter my mom needs me microscope a little like that -- it's and -- that Lagos today.

This transcript has been automatically generated and may not be 100% accurate.

Boy's desire for a discontinued Lego set catches attention of toymaker.

Now Playing: Lego Comes Through Big for Young Fan

Now Playing: North West 'Works' It At Recording Studio

Now Playing: Taylor Swift Jams With Six Year Old In Hospital

Now Playing: Sandra Bullock Tops List of Highest Earning Actresses

Now Playing: LEGO Debuts Female Scientist Figurines

Now Playing: Flash Floods Cause Devastating Mudslides in California

Now Playing: Second American Ebola Victim Is Ready to Come Home

Now Playing: Contamination Leaves Toledo Residents Without Drinking Water

Now Playing: Mystery at the Racetrack: 10 Horses Dead this Season

Now Playing: Michael Strahan Joins Football's All-Time Greats

Now Playing: Texas Woman Allegedly Faked a Robbery to Kill Her Husband

Now Playing: Possible Sighting of Missing Oregon Mother

Now Playing: Caught on Tape: Is an African Lion Roaming Streets of California?

Now Playing: Warning for Parents Over New Viral 'Fire Challenge'

Now Playing: Beyonce References Elevator Fight on 'Flawless' Remix

Now Playing: Former American Idol Finalist Michael Johns Dead at 35

Now Playing: 'Guardians of the Galaxy' Breaks August Box Office Record

Now Playing: Cheryl Hines and Robert F. Kennedy Jr. Wedding Details

Now Playing: Mother of Five Defends Her Stretch Marks on Facebook

Now Playing: Learn the Truth Behind the Term 'Superfood'

Now Playing: {{itm.title}}

{"id":24837808,"title":"LEGO Debuts Female Scientist Figurines","duration":"0:58","description":"The company responded to a request from a 7-year-old girl.","url":"/GMA/video/lego-debuts-female-scientist-figurines-24837808","section":"GMA","mediaType":"default"}